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* [PATCH 1/1] riscv: define find_{first,next}_zero_bit in asm/bitops.h
@ 2024-07-26 12:07 Maxim Kochetkov
  2024-07-27 10:35 ` [PATCH 1/1] riscv: define find_{first, next}_zero_bit " E Shattow
  2024-09-09  7:01 ` [PATCH 1/1] riscv: define find_{first,next}_zero_bit " Leo Liang
  0 siblings, 2 replies; 5+ messages in thread
From: Maxim Kochetkov @ 2024-07-26 12:07 UTC (permalink / raw)
  To: u-boot, rick, ycliang, trini; +Cc: Maxim Kochetkov

These seem to be missing, and trying to build fastboot cmd without
them is causing errors due to these being missing.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
---
 arch/riscv/include/asm/bitops.h | 40 +++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/arch/riscv/include/asm/bitops.h b/arch/riscv/include/asm/bitops.h
index 35f1368b83..2f2994c4dd 100644
--- a/arch/riscv/include/asm/bitops.h
+++ b/arch/riscv/include/asm/bitops.h
@@ -138,6 +138,43 @@ static inline unsigned long ffz(unsigned long word)
 	return k;
 }
 
+static inline int find_next_zero_bit(void *addr, int size, int offset)
+{
+	unsigned long *p = ((unsigned long *)addr) + (offset / BITS_PER_LONG);
+	unsigned long result = offset & ~(BITS_PER_LONG - 1);
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= (BITS_PER_LONG - 1);
+	if (offset) {
+		tmp = *(p++);
+		tmp |= ~0UL >> (BITS_PER_LONG - offset);
+		if (size < BITS_PER_LONG)
+			goto found_first;
+		if (~tmp)
+			goto found_middle;
+		size -= BITS_PER_LONG;
+		result += BITS_PER_LONG;
+	}
+	while (size & ~(BITS_PER_LONG - 1)) {
+		tmp = *(p++);
+		if (~tmp)
+			goto found_middle;
+		result += BITS_PER_LONG;
+		size -= BITS_PER_LONG;
+	}
+	if (!size)
+		return result;
+	tmp = *p;
+
+found_first:
+	tmp |= ~0UL << size;
+found_middle:
+	return result + ffz(tmp);
+}
+
 /*
  * ffs: find first bit set. This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
@@ -158,6 +195,9 @@ static inline unsigned long ffz(unsigned long word)
 #define hweight16(x) generic_hweight16(x)
 #define hweight8(x) generic_hweight8(x)
 
+#define find_first_zero_bit(addr, size) \
+	find_next_zero_bit((addr), (size), 0)
+
 #define test_and_set_bit		__test_and_set_bit
 #define test_and_clear_bit		__test_and_clear_bit
 
-- 
2.45.2


^ permalink raw reply related	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-09-09  7:02 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-07-26 12:07 [PATCH 1/1] riscv: define find_{first,next}_zero_bit in asm/bitops.h Maxim Kochetkov
2024-07-27 10:35 ` [PATCH 1/1] riscv: define find_{first, next}_zero_bit " E Shattow
2024-07-29  5:47   ` [PATCH 1/1] riscv: define find_{first,next}_zero_bit " Maxim Kochetkov
2024-08-30  2:28     ` [PATCH 1/1] riscv: define find_{first, next}_zero_bit " E Shattow
2024-09-09  7:01 ` [PATCH 1/1] riscv: define find_{first,next}_zero_bit " Leo Liang

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